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Peripheral neuropathy in hereditary spastic paraplegia caused by REEP1 variants

  • Anders ToftEmail author
  • Steffen Birk
  • Martin Ballegaard
  • Morten Dunø
  • Lena E. Hjermind
  • Jørgen E. Nielsen
  • Kirsten Svenstrup
Original Communication
  • 14 Downloads

Abstract

SPG31 is a hereditary spastic paraplegia (HSP) caused by pathogenic variants in the REEP1 gene. The phenotype (SPG31) has occasionally been described with peripheral nervous system involvement, in additional to the gradually progressing lower limb spasticity that characterizes HSP. The objective of this study was to characterize patients with pathogenic REEP1 variants and neurophysiologically assess the extent of peripheral nerve involvement in this patient group. Thirty-eight index cases were molecular-genetically tested, yielding two previously reported pathogenic REEP1 variants and a novel missense variant, in a total of four index patients. Three of four probands and five additional family members underwent nerve conduction studies, electromyography, quantitative sensory testing, and examination of the autonomic nervous system. None of the examined patients had completely unremarkable results of peripheral nerve studies. Most showed electrophysiological signs of carpal tunnel syndrome, and one patient demonstrated a multifocal compression neuropathy. Autonomic testing revealed no severe dysfunction, and findings were limited to adrenergic function. HSP caused by pathogenic REEP1 variants may be accompanied by a generally mild and subclinical polyneuropathy with a predisposition to compression neuropathy, and should be considered in such cases.

Keywords

Hereditary spastic paraplegia REEP1 SPG31 Nerve conduction studies Polyneuropathy Carpal tunnel syndrome 

Notes

Acknowledgements

The study was supported by Ludvig and Sara Elsass Foundation and the Novo Nordisk Foundation.

Compliance with ethical standards

Conflicts of interest

The authors declare that they have no competing interests.

Supplementary material

415_2019_9196_MOESM1_ESM.docx (14 kb)
Supplementary material 1 (DOCX 14 KB)
415_2019_9196_MOESM2_ESM.docx (16 kb)
Supplementary material 2 (DOCX 16 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Neurology, Rigshospitalet, Neuromuscular Research CenterUniversity of CopenhagenCopenhagenDenmark
  2. 2.Department of Clinical Neurophysiology, RigshospitaletUniversity of CopenhagenCopenhagenDenmark
  3. 3.Department of Clinical Genetics, RigshospitaletUniversity of CopenhagenCopenhagenDenmark
  4. 4.Department of Neurology, Neurogenetics Clinic, Rigshospitalet, Danish Dementia Research CentreUniversity of CopenhagenCopenhagenDenmark
  5. 5.Department of Neurology, Bispebjerg HospitalUniversity of CopenhagenCopenhagenDenmark

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